[fprint] modular libfprint

[Pavel Herrmann]

Hi

Once again, there is a new version of my modular patch. This time, I 
added a simple detection of available hardware (comparing 
/proc/bus/usb/devices and libfprint/drivers/* files) which appears to 
work fine in lab condition (I don't own any of these devices so I had to 
fool it a little).

There are some things that could break it, like not using the $driver.c 
(or precisely $driver.[any one character]) for the name of the file 
containing USB IDs or having restricted access to /proc.

Fallback is to build all drivers as the device is probably not connected 
at the moment

Testing is appreciated,  but I am pretty sure it will work just fine  ;-)

Pavel
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